Anemia is a clinical manifestation, which is commonly observed in patients with inflammatory bowel disease, and it accounts for significant loss in the quality of life of these patients. The aim of the current study is to assess the effect of orally administered iron treatment, as well as its response predictors in patients with inflammatory bowel disease who are in remission and present anemia. The study will recruit 100 patients with Crohn's disease (CD) and 100 patients with ulcerative colitis (UC) diagnosed and regularly monitored in the Inflammatory Bowel Disease Center at the University Hospital of the Federal University of Juiz de Fora, for clinical, hematological, biochemical and immunological assessment. Blood samples will be collected (10 ml) and the following tests will be performed in all the anemia patients (in remission) at the beginning of the treatment and 8 weeks later: complete blood count, mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), erythrocyte sedimentation rate (ESR) , transferrin saturation index, ferritin, serum iron, hepcidin, quantitative C-reactive protein (CRP), interleukin-6 (IL-6)) and fecal calprotectin. In addition, quality of life, anxiety and depression and fatigue questionnaires will be applied to the patients (IBDQ, HAD and Chalder). The World Health Organization (WHO) criteria will be used to diagnose anemia, therefore, hemoglobin lower than 12 g/dl for women and 13g/dl for men will be considered anemia; hemoglobin lower than 10 g/dl will be considered severe anemia. Patients with mild and moderate anemia in remission will be initially treated with oral iron (oral liposomal iron) and the occurrence of possible symptoms related to oral iron intolerance will be assessed, as well as the patients' disease activity level and quality of life. The patients in follow-up will be subjected to new laboratory tests after the eighth oral iron treatment week. The results of the current study are expected to help assessing the oral iron efficacy and response predictors, as well as the side effects of the treatment and its impact on the quality of life of patients.